Blank Carpet is a decorative furniture item that can display the colors or patterns of wall Paintbrushes.
Furniture Brushes do not work on Blank Carpets.
The "Carpets and Paintings" blueprint set must be purchased from Roman before the Blank Carpet can be crafted at a Paint Station.
To customize a Blank Carpet, walk up to it with a wall paintbrush, and press E when the tether 'connects' to the item. To change the design, just paint over the existing one.
Picking up a customized Blank Carpet with a Hammer returns the item to its blank state.